There are some discreet frequencies which are known to the people who need to know.
During a trip in August, from Canada to Wyoming, to see the total eclipse, I was mystified when my pilot said to the aircraft accompanying us "See you on Cheap Suits". All became clear when he dialed in 129.95!
When I was first introduced to formation flying in Chipmunks, there was a procedure which had never occurred to me, but the reason became immediately obvious. When changing formation lead, the current lead would brief the new lead on where we were and what was our heading.
The reason of course is that the rest of the formation have no idea where they are - they were just concentrating on station keeping.